2025 Volume 25 Issue 2 Pages 2_32-2_41
Re-shear tests have been conducted on the ruptured full-scale lead rubber bearings (LRBs) with a diameter of 1600 mm to confirm residual performance of LRBs. The ruptured specimens and the unruptured ones have been observed on the completely same hysteresis loops of restoring force up to strain of 100%, and the mechanical features of them are approximately similar to one another until shear strain 200%. Moreover, buckling phenomenon, i.e. the sudden vertical subduction, are not observed even after the contact surfaces of the ruptured specimens start to slide. These results suggest that horizontal and vertical resistance performance remains in ruptured bearings to some extent.
